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Derivative Instruments and Hedging Activities - Additional Information (Detail)	Mar. 31, 2021 USD ($) Country	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 EUR (€)	Mar. 31, 2020 EUR (€)	Dec. 31, 2019 EUR (€)
Derivative [Line Items]
Number of countries in which Schlumberger generates revenue \| Country	120
Denominated debt issued			$ 500,000,000	€ 2,000,000,000.0	€ 800,000,000	€ 1,500,000,000
Fair value of outstanding derivatives	$ 0	$ 0
0.00% Notes due 2024
Derivative [Line Items]
Notes, face amount \| €						€ 500,000,000
Derivative swap interest rate						0.00%
0.25% Notes due 2027
Derivative [Line Items]
Notes, face amount \| €					€ 400,000,000	€ 500,000,000
Derivative swap interest rate					0.25%	0.25%
Promissory note interest rate					0.25%
0.50% Notes due 2031
Derivative [Line Items]
Notes, face amount \| €					€ 400,000,000	€ 500,000,000
Derivative swap interest rate					0.50%	0.50%
Promissory note interest rate					0.50%
1.375% Guaranteed Notes due 2026
Derivative [Line Items]
Notes, face amount \| €				€ 1,000,000,000.0
Derivative swap interest rate				1.375%
2.00% Guaranteed Notes due 2032
Derivative [Line Items]
Notes, face amount \| €				€ 1,000,000,000.0
Derivative swap interest rate				2.00%
1.40% Senior Notes due 2025
Derivative [Line Items]
Notes, face amount			$ 500,000,000
Derivative swap interest rate			1.40%
Cross currency swaps
Derivative [Line Items]
Notional amount of interest rate swap			$ 500,000,000	€ 2,000,000,000.0	€ 800,000,000	€ 1,500,000,000
Cross currency swaps \| 0.00% Notes due 2024
Derivative [Line Items]
Promissory note interest rate						2.29%
Cross currency swaps \| 0.25% Notes due 2027
Derivative [Line Items]
Promissory note interest rate					1.87%	2.51%
Cross currency swaps \| 0.50% Notes due 2031
Derivative [Line Items]
Promissory note interest rate					2.20%	2.76%
Cross currency swaps \| 1.375% Guaranteed Notes due 2026
Derivative [Line Items]
Promissory note interest rate				2.77%
Cross currency swaps \| 2.00% Guaranteed Notes due 2032
Derivative [Line Items]
Promissory note interest rate				3.49%
Cross currency swaps \| 1.40% Senior Notes due 2025
Derivative [Line Items]
Promissory note interest rate			1.73%
Cross currency swaps \| Other Assets
Derivative [Line Items]
Derivative assets	367,000,000	427,000,000
Cross currency swaps \| Other Liabilities
Derivative [Line Items]
Derivative liability	22,000,000	$ 13,000,000
Foreign exchange contracts
Derivative [Line Items]
Notional amount of interest rate swap	8,400,000,000
Foreign exchange contracts \| Debt \| Derivatives designated as hedges
Derivative [Line Items]
Notional amount of interest rate swap	$ 6,200,000,000